Species: Lecanora sulphurea
Photos: On acidic coastal rocks. Dunmanus Bay, Cork, SW Ireland.
Identified by Mike Simms
Thick warted and cracked, yellowish-grey to bright yellow-green thallus surrounded by greenish-black prothallus. The immersed pale, irregular apothecia become blackish with pale grey pruina.
Exposed nutrient-rich siliceous walls and rocks, also parasitic on Tephromela and Lecanora species. Found on coast and inland.
K- or K+ dirty-yellow, KC+ yellow
Lecanora sulphurea on acidic coastal rocks. March 2009